Carbureter



i" JTO all-whom it' concern.'

CHARLES'H. xIRBY, 0F DETROIT, Iranien, AssIGNoR To'DE'rRorr LUBRICVATOB.

' COMPANY, 0F DETROIT,MICHIGAN, `A CORPORATION OF MICHIGAN.

Be it known'that I, CHARLES Kraay, a citizen ofthe United States' ofv America, residing at Detroit, 4in the county of Wayne and State of Michigan, have invented cer;A Atain new and useful Improvements in Carbureters, fof which the following vis a speci- A cat'ion, reference being had thereinl tothe accompanying drawings.

The invention relates to carbureters of that type, in which the ladmission of fueltoV the lmlxing chamber is controlled-,by an automatic air valve. It is. the object of the inair valve, which might otherwise tend to' vention to provide means for supplying -additional liquid. fuelto 'said mixing chamber upon the` suddenopening movement,- of said impoverish themixture dueto the reater inertiaof' the liquid than that of the a1r. To this 4end th'e ,invention comprises the construction as hereinafterset forth.'-

The ldrawing is a sectional elevation-of a' ,carbureter to which my improvements lare applied. 5 3

1 A isfthelmixing chamber.- is the air inlet passage. C is an vautomatic valve in said air inlet passage having a` central o il d1scharge.no'zzle" D and/a surrounding alr passage E. Fis a meterlng pin for restrict-' 4 king the oil passage-to the nozzle, and which coperates with said valve C to' vary the restriction in different positions of the valve.

the relative movement'ofthe valve and the `metering pin also increasing .the flow of` oil G is the `manually-operablethrottle valve 4controlli-ng the connection'between-the mix- .ing chamber andthe induction conduit to the engine. Y The .construction is so organized that when the valve C is closed the metering l pin produces the maximum restriction to the supply of oil while -the air passing through thevalve andthe'passage E surrounding the nozzle formsan ejectorfor discharging oil chamber.` vWhen thesuc into saidfmixing) tion isincreased y the openingof the throt-` tle Gthe valve C is lifted from its seat, which .45

results in increasing the'flow `of air, and by tov `produce -a proportionate mixture. If,

. however,'the opening of the throttle is sud' den" the vinertia of the oil will retard its increase in flow, so that a greater proportion of airis' admitted and the mixture becomes lean.

vTopovercome the defect justv described,- I

havey devised the following construction: H5-

isy arfvpistonfconnected' to .the valve C 'and CARBRETER.

ASpeeieatiene! Letters Patent.

materiall effect. the

Patent/eg Aug. 9, 1921.

Alipncation-nieasptember 20,1915. seal Nb. 51,583.

moving in acylinderI, which'forms in connection therewith a dash pot for retarding the opening movement vof said valve, thereby retarding the flow ofair. To increase the effectivenessof this dash-pot, a check' valve J isarrangedP in the oil supply, and closes upon the rise of the piston so as to prevent movement thereof excepting in lso faras there is leakage of the oil around thepiston. This c losinglof 'the check valve will cause a rise inpressure on the oil, WhichLI further utilizein raising a small quantity of oil` above the normal'level to form an auxiliarysupply to the -mixing chamber. shown, K is al passage rising from the cyl- *inde'r I, and L isa vent passage formed in Thus, as

the carbureter casing connectedloy apassage M leading to the mlxing chamber., and also connected to the passage K. The arrangement is such that if the. oil rises vin the pas# sage K above the vent L; the-air drawn through said vent by lthe suction in the vn 1ix.

ing chamberA willcause the discharge of oil into thelatter. Thus. the effect of the sudden openingbf the throttle is not only to throw into-action the. dash-pot forretarding the movement of the valve C, but also to'.

lift a quantity of oil into the pathvof 'the vented air passage, so that it is discharged into the mix-ing chamber to increase the richness of the mixture, 'On the otherhand, when the abnormal pressure in the chamber I is relieved the levelof thef'oil will drop lbelow the vent L, which will permit air only to enter the mixing chamber and the restriction ofthe passage is such as to not e v quality of themixture by this a ditional'air. To permit the viston'H to-descend quickly when thevalve is closingI acheck valve N is preferably arrangedin said piston, said valve closing in the upward movement of' the pistonfto produce a retardin 'and 4oil lifting effect, as has been describe' What I claim as my invention is 1. In a carbureter, the combination with amixing chamber and an automatic valve controlling the air inlet thereto, of. a dashpot for retarding the opening movement of said valve, said dash pot havmg connection with the oil supply, a check valve for closing the oil supply when said dash-pot is in j action, an oil passage rising from said dashpot filled by the pressure in said dash pot-- when said check valve is closed, and a vnt passage connecting with said mixing chamber intercepted by said oil passage. i

2. In a caibureter, the combination with a mixing chamber, of an automatic valve controlling the air admissionto said chamber, a cylinder connected with the oil-supply, a piston in said cylinder connected to said automatic valve, a checlrvalve in the oil supply, a passage leading upward from said cylinder above the normal oil level, and a vent passage connecting with said mixing chamber intercepted by said oil passage. 3. In a carbureter, the combination with a mixing chamber, of an automatic valve` controlling the air admission to said chamber, a cylinder connected with the oil supply, a piston in said cylinder connected to said automatic valve and forming a'dashpot therefor, a check valve in the oilv supply closed by the rise in pressure in said cylinder due to the lifting of said valve and piston, a check valve permitting the free descent of said piston, a passage connecting with said cylinder rising to above the normal level of the oil, and a vent passage connecting with the mixing chamber intercepted by said oil passage.

4. In a carbureter, the combination with a mixing chamber and an automatic valve controlling the air inlet thereto, of. a dashpot for retarding the opening movement of said valve, said dash pot having connection with the oil supply, a check valve for closing the,oil supply when said dash-pot is in action and an oil passage rising from said dash-pot filled by 'the pressure in said sup-ply preventing back pressure acting upon the oil supply as the piston rises and a passage leading upward from said cylinder above the normal oil level and communicating with the mixing chamber.

6. In a carbureter', the combination with a mixing chamber, of an automatic valve controlling the air admission to said chainber', acylinderconnected with the oil supply, a piston linvsai'd cylinder connected to said automatic valve and cof-acting with said cylinder to form a, dash-pot for sa-id valve, a check valve in the oil supply closed by the risein pressure in said cylinder due to lift- -ing of said valve and piston, a check valve permitting the free descent 'of said piston and a'passage connecting with said cylinder rising to above the normal level of the oil and communicating with ber.

.In testimony whereof I alix in presence of two witnesses.

CHARLES yii'. KIRBY.

Witnesses:

WM. J. BELKNAP, PHYLLIs COBURN.

the mixing cham.

my signature 

